Coachbox

Coaches were juggling spreadsheets, WhatsApp messages and scattered apps to keep track of their athletes. Training data from Garmin, Polar and other devices lived in separate silos. No central overview. No way to detect overtraining before it was too late.

I built Coachbox to change that: one platform where coaches create training plans, monitor results and communicate directly with their athletes — from recreational runners to professional cyclists and Olympians.

When an athlete trains with a smartwatch or bike computer, data syncs automatically. Coaches see completed workouts in real time and get notified if a session didn't go as planned.

Measuring training load with science

One of the hardest calls for a coach: is my athlete doing too much or too little? In collaboration with Ghent University, I developed the Coachbox Stress Score — a science-backed model that quantifies training load. Plotted on the Coachbox Fitness Trend graph, coaches can see at a glance whether an athlete is on track, at risk of overtraining, or ready for more.

From sports to healthcare

Coachbox is also used beyond athletics. At UZ Leuven university hospital, doctors use the platform to track the physical recovery of patients after organ transplants. What started as a sports tool now helps improve lives in clinical aftercare.

Results

• 30,000+ registered users
• 11,000,000+ logged workouts
• #2 app in the Belgian App Store (Sports category) at launch
• Scientific collaboration with Ghent University
• Clinical use at UZ Leuven university hospital

What I built

Together with two other founders, I built Coachbox from the ground up. My role: the entire technical side — from the first wireframes to the web platform, the iPhone and Android apps, and the server infrastructure that keeps it all running. Design, development and operations, all in one hand.

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